A fuel injector 100 includes a nozzle member 60 having a fuel passage 60a leading to an injection port 60b; a valve main body 51 adapted to reciprocate for opening and closing the fuel passage 60a; an elastic portion 56 elastically deformable in closing the fuel passage 60a by movement of the valve main body 51 in a closing direction, the elastic member being attached to one of the nozzle member 60 and the valve main body 51 and adapted to be abutted against the other of the nozzle member 60 and the valve main body 51 to close the fuel passage 60a by moving the valve main body 51 in the closing direction; and a stopper 70 adapted to restrict movement of the valve main body 51 in the closing direction by being abutted against the valve main body 51, the stopper 70 being formed of material different from the nozzle member 60.

The invention relates to an injection device for an internal combustion engine, comprising a needle and an armature, which is operatively connected to the needle in such a way that a movement of the needle can be produced by movement of the armature, the armature having at least one passage bore, through which fuel can be conducted to a needle tip, characterized in that a longitudinal axis of the needle and a longitudinal axis of the passage bore are oriented askew in relation to each other.

A fluid injector for injecting fluid is disclosed, including a body; a fluid passageway defined in the body and extending from an inlet to an outlet of the fluid injector; a valve seat disposed internally of the body and forming part of the passageway; a valve element that is selectively reciprocated relative to the valve seat to close and open the passageway to fluid flow by seating and unseating the valve element on and from the valve seat, respectively; and an orifice disc disposed in the passageway downstream of the valve seat in a direction of the fluid flow through the fluid injector, the orifice disc including a plurality of dimples and a plurality of orifices defined through the orifice disc, each dimple including at least one orifice located thereon and each dimple having an asymmetrical cross-section.

A system for controlling actuation of an electromagnetic actuator includes an actuator having an electrical coil, a magnetic core, and an armature. A controllable drive circuit is responsive to an electric power flow signal for driving current through the electrical coil to actuate the armature. A control module includes an armature motion observer configured to determine an armature motion parameter in the actuator based upon a magnetic flux within the actuator and a predetermined mechanical equation of motion corresponding to the actuator and adapt the electric power flow signal based on the armature motion parameter.

Provided is a fuel injection valve capable of quickly stopping a position of a movable element at a predetermined position after closing a valve while reducing an impact force of a valve body. Therefore, a valve body 101 includes a sleeve 113. A first movable core 201 (first movable element) lifts the valve body 101 by the attractive force of a magnetic core 107. A second movable core 202 (second movable element) further lifts the valve body 101 by the attractive force of the magnetic core 107 after the first movable core 201 (first movable element) lifts the valve body 101. After the valve body 101 is seated on the seat member 102 and the second movable core 202 (second movable element) is separated from the sleeve 113, a bottom surface 201g of the first movable core 201 (first movable element) collides with a storage bottom surface 111b (collision receiving portion).

An object of the present invention is to provide a fuel injector which can promote convergence of a motion of a valve body while a valve is opened and promote stabilization of an injection amount. In the present invention, a fuel injector includes a movable iron core 404, a fixed iron core 401, a first spring member 405, a second spring member 406, contact portions 102c and 404b′, and a gap g1. The movable iron core 404 is provided relatively displaceable to a valve body 102. The fixed iron core 401 is opposed to the movable iron core 404. The first spring member 405 energizes the valve body 102 in a valve closing direction. The second spring member 406 energizes the movable iron core 404 in a valve closing direction. The contact portions 102c and 404b′ are in contact with each other in a case where the movable iron core 404 displaces in a valve opening direction with respect to the valve body 102. The gap g1 is formed between the contact portions 102c and 404b′ in a valve closing state. In a state in which the movable iron core 404 and the valve body 102 move in different directions after the movable iron core 404 collides with the fixed iron core 401 while a valve is opened, a spring force is not applied between the movable iron core 404 and the valve body 102.

The disclosure relates to a fuel injection valve that includes a valve needle, a closing spring applying a spring force to the valve needle, which spring force loads the valve needle in the direction of a closing position, and an actuator assembly. A coil of the actuator assembly produces a magnetic force on a magnet armature of the actuator assembly such that, as the magnet armature travels toward a pole piece of the actuator assembly,. the magnet armature covers an idle stroke to a stop element of the valve needle and then carries the valve needle toward the pole piece. A spring constant of the closing spring and the magnetic force are matched such that the magnitude of the resultant force of the spring force and the magnetic force decreases with increasing distance of the valve needle from the closing positionand remains the same with increasing the distance.

A fuel injection valve includes: a movable arrangement that is coupled to a movable core and a needle while a movable flow passage, which forms a part of a flow passage of the fuel injection valve, is formed at an inside of the movable arrangement; and a valve main body that receives the movable arrangement. The movable arrangement has: a first flow-restricting portion that reduces a cross-sectional area of a portion of the movable flow passage; and a second flow-restricting portion that is spaced away from the first flow-restricting portion and reduces a cross-sectional area of another portion of the movable flow passage to a cross-sectional area that is equal to or larger than a cross-sectional area of the first flow-restricting portion. A distance between the first flow-restricting portion and the second flow-restricting portion is larger than an equivalent diameter of the cross-sectional area of the second flow-restricting portion.

The invention relates to an electromagnetically actuatable metering valve for liquids and/or gases, comprising: a valve housing (1); a valve seat element (2) which is connected to the valve housing (1) and in which at least one outlet opening (3) is formed; and a magnetic armature (4) which can move in a stroke-like manner relative to the valve seat element (2) and which is securely connected to a plate- or disc-shaped valve closing element (5) for opening and closing the at least one outlet opening (3) or which forms same; as well as a magnetic core (6) opposite the magnetic armature (4) at a working air gap (14) and at least one spring (7) pretensioning the magnetic armature (4) and the valve closing element (5) in the closing direction. According to the invention, the magnetic armature (4) and the valve closing element (5) are loaded in a targeted asymmetrical manner and/or are shaped in a targeted asymmetrical manner The invention also relates to a method for operating a metering valve for liquids and/or gases.

A valve is used to meter a fluid. The valve can be fashioned in particular as a fuel injection valve for internal combustion engines. The valve has a housing part that is surrounded on its outer side by an extrusion coating. On the outer side of the housing part there is fashioned at least one recess into which the extrusion coating is at least partly introduced.